Initial commit: mini-erp (backend FastAPI + frontend React/Vite)

Base para el flujo de ramas por cliente.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

mini-frontend/src/utils/api.ts

@@ -0,0 +1,91 @@
+const SESSION_TIMEOUT_MS = 30 * 60 * 1000;
+
+export const API_URL = import.meta.env.VITE_API_URL || "http://localhost:8000";
+
+interface SessionData {
+  token?: string;
+  username?: string;
+  company?: string;
+  lastActivity?: number;
+}
+
+function getSession(): SessionData {
+  try {
+    return JSON.parse(localStorage.getItem("sap_session") || "{}");
+  } catch {
+    return {};
+  }
+}
+
+function saveSession(data: SessionData): void {
+  localStorage.setItem("sap_session", JSON.stringify(data));
+}
+
+function clearSession(): void {
+  localStorage.removeItem("sap_session");
+}
+
+export function getToken(): string | null {
+  return getSession().token || null;
+}
+
+export function getUsername(): string | null {
+  return getSession().username || null;
+}
+
+export function getCompany(): string | null {
+  return getSession().company || null;
+}
+
+export function setSession(token: string, username: string, company?: string): void {
+  saveSession({ token, username, company, lastActivity: Date.now() });
+}
+
+function hasTimedOut(): boolean {
+  const session = getSession();
+  if (!session.lastActivity) return false;
+  return Date.now() - session.lastActivity > SESSION_TIMEOUT_MS;
+}
+
+function updateLastActivity(): void {
+  const session = getSession();
+  if (session.token) {
+    session.lastActivity = Date.now();
+    saveSession(session);
+  }
+}
+
+function expireSession(): void {
+  clearSession();
+  window.location.href = "/login";
+}
+
+export async function apiFetch(url: string, options: RequestInit = {}): Promise<Response> {
+  if (hasTimedOut()) {
+    expireSession();
+    throw new Error("Sesión expirada");
+  }
+
+  const token = getToken();
+  const headers: Record<string, string> = {
+    "Content-Type": "application/json",
+    ...(token ? { "X-Session-Token": token } : {}),
+  };
+
+  const customHeaders = options.headers as Record<string, string> | undefined;
+  if (customHeaders) {
+    for (const key of Object.keys(customHeaders)) {
+      headers[key] = customHeaders[key];
+    }
+  }
+
+  const response = await fetch(url, { ...options, headers });
+
+  if (response.status === 401) {
+    expireSession();
+    throw new Error("Sesión expirada");
+  }
+
+  updateLastActivity();
+  return response;
+}